I actually really love Realtytrac and have used it off and on multiple times. As a realtor, you would benefit from it if you have a number of investor clients looking for properties that are potentially not on the MLS. In addition, if you yourself are in investor its great.
The basic information is what phase of foreclosure the property is in, if there are any liens on the property (which isn't always listed), who the owner is (you can actually send the owner a postcard directly from the site which is pretty cool).
If you are just a browser, or don't have any investor clients, than I would say save your money. Otherwise, I think it's awesome!